Journal of the Korean Society of Fisheries and Ocean Technology (수산해양기술연구)

The Korean Society of Fisheries and Ocean Technology (한국수산해양기술학회)
권호 표지
DOI QR코드

DOI QR Code

Hydrodynamic Forces on Fish Cage Systems under the Action of Waves and Current

가두리 시설이 파랑과 흐름에 의해 받는 유체력 특성

  • Kim, Tae-Ho (National Fisheries Research and Development Institute) ;
  • Kim, Chang-Gil (National Fisheries Research and Development Institute) ;
  • Kim, Ho-Sang (National Fisheries Research and Development Institute) ;
  • Baik, Chul-In (National Fisheries Research and Development Institute) ;
  • Ryu, Cheong-Ro (Pukyong National University)
  • Published : 2002.08.01
Download PDF
⟨ Previous Next ⟩

Abstract

In order to analyze the hydrodynamic forces on fish cage systems, made of frames and nettings, under waves and current, hydraulic model experiments for square type and circular type of fish cage system were carried out in a towing tank. Both cage systems consist of net cages supported by floating frames made of two concentric pipes and four weights hanging from the bottom corners of the nets. There was little difference in the hydrodynamic force on the square type of fish cage system by wave heading under regular waves and the peak frequency of the force on each cage system was in a good agreement with that of induced irregular wave. In addition, it was also observed that the circular type of cage system was more stable to the action of waves and current than the square type.

규칙파와 불규칙파 및 흐름이 함께 작용하는 상태에 놓인 가두리 시설에 대해 작용 유체력을 가두리 시설의 부설 방향별로 해석하기 위하여, 정사각형 모형 가두리 시설과 원형 모형 가두리 시설을 대상으로 예인 수조에서 수리 모형 실험을 실시하였다. 실험에서 얻어진 결과를 요약하면 다음과 같다. 1. 규칙파를 받고 있는 정사각형 가두리 시설에 작용하는 유체력은 가두리 시설의 부설 방향별로 큰 차이를 보이지 않았다. 2. 불규칙파와 흐름을 동시에 받고 있는 가두리시설에 작용하는 파력 에너지의 피크 주파수는 파의 그것과 잘 일치하였고, 작용 유체력은 정사각형 가두리 시설보다 원형 가두리 시설에서 더 작았다. 3. 가두리 시설의 안정성에서 있어서는 그 구조가 원형인 것이 정사각형인 것보다 나은 편이었다.

Keywords

References

  1. Clauss, G., Lehmann, E. and Ostergaard, C (1988) : Ocean structure engineering, Verlag Berlin Heideiberg, 288-321
  2. Fu, E. B., Sato, O., Nashimoto, K. and Yamamoto., K.(1989) : Fluid force on simplified models of aquaculture net cage, Nippon Suisan Gakkashi 55(7), 1211-1216 (in Japanese) https://doi.org/10.2331/suisan.55.1211
  3. Fu, E. B., Nashimoto, K., Yamamoto, K.,Hiraishi, T. and Takagi, T.(1994) : Model experiment examination of mooring methodin aquaculture net cage, Bulletin of the Faculty of Fisheries, Hokkaido University 45(1), 9-18 (in Japanese)
  4. Fujita, S., Fukahori, K. and Nishinokubi, H.(1991) : Tension of the mooring ropes on the net cage model of raft type in regularwaves, Nippon Suisan Gakkashi 57(12), 2229-2235 (in Japanese) https://doi.org/10.2331/suisan.57.2229
  5. Hideshima, Y.(1982) : Fundamental study on mooring force of the aquacultural wire netting cage (1), Fisheries Engineering19(1), 1-6 (in Japanese)
  6. Kim, T. H., Kim, J. O. and Ryu, C. R.(2001) :Dynamic motions of model fish cagesystems under the conditions of waves andcurrent, J. Korean Fish. Soc. 34(1), 67U84(in Korean)
  7. Ormberg, H.(1991) : Non-Ulinear response analysis of floating fish farm systems, Ph. D. thesis,Division of Marine Structures, The Norwegian Institute of Technology, Trondheim, 54-79
  8. Ormberg, H. and Slaattelid, O. H.(1993) :Response analysis of floating fish farms, Proceedings of The first International Conference on Fish Farming Technology,185-192
  9. Slaattelid, O. H.(1990) : Model test with flexible,circular floats for fish farming, Engineering for Offshore Fish Farming Conference,Glasgow, United Kingdom, 93-106

Cited by

  1. Analysis on underwater stability of the octagonal pillar type fish cage and mooring system vol.50, pp.2, 2014, https://doi.org/10.3796/KSFT.2014.50.2.193